以下哪项因素可以引起便秘
A．食物中缺乏纤维素B．结肠肿瘤C．精神因素D．脊髓损伤E．以上都是
参考答案：E
Although I had read the book assigned by theprofessor several times,it didn't make
any _____ to me. [ ]
A. meaning
B. importance
C. sense
D. significance
社区卫生服务以哪类人为主要卫生人力
A．全科护士
B．流行病学专家
C．全科医生
D．牙医
E．社区管理者
